
UNIDENTIFIED

786 ACIO VESA MOTHERBOARD

Processor        80386DX/CX486DLC/80486SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unknown
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             Unknown
Dimensions       254mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      80387DX

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Power LED & keylock         J2       External battery            J7

  Turbo switch                J4       Speaker                    J100

  Turbo LED                   J5       32-bit VESA Local bus       S1
                                       slot

  Reset switch                J6       32-bit VESA Local bus       S2
                                       slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                J3             Closed

      Monitor type select monochrome           J3              Open

     CMOS memory normal operation            JMP3          pins 2 & 3
      (Internal battery)                                      closed

     CMOS memory normal operation            JMP3          pins 1 & 2
      (External battery)                                      closed

      CMOS memory clear                       JMP3          pins 2 & 4
                                                              closed

     NPU enabled                             JMP4          pins 1 & 2
                                                              closed

      NPU disabled                            JMP4          pins 2 & 3
                                                              closed

     Factory configured - do not             JMP6          pins 1 & 4
      alter                                                   closed

     VESA local bus enabled                 JMP10             Open

      VESA local bus disabled                JMP10            Closed

                     DRAM CONFIGURATION

        Size              Bank 0              Bank 1

        1MB            (4) 256K x 9            NONE

        2MB            (4) 256K x 9        (4) 256K x 9

        4MB             (4) 1M x 9             NONE

        5MB             (4) 1M x 9         (4) 256K x 9

        8MB             (4) 1M x 9          (4) 1M x 9

        16MB            (4) 4M x 9             NONE

        32MB            (4) 4M x 9          (4) 4M x 9

  Note:The exact locations of Bank 0 & Bank 1 is unknown.

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1        TAG/U26        TAG/U27

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8     (1) 8K x 8

     128KB      (4) 32K x 8        NONE       (1) 8K x 8     (1) 8K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8    (1) 32K x 8

  Note:The exact locations of Bank 0 & Bank 1 is unknown.

                        CACHE JUMPER CONFIGURATION

   Size         JMP1A            JMP1B           JMP1C           JMP8

   64KB       pins 1 & 2       pins 1 & 2      pins 1 & 2     pins 1 & 2
                closed          closed          closed        and 4 & 5

   128KB      pins 2 & 3       pins 1 & 2      pins 2 & 3     pins 2 & 3
                closed          closed          closed        and 4 & 5

   256KB      pins 2 & 3       pins 2 & 3      pins 2 & 3     pins 2 & 3
                closed          closed          closed        and 5 & 6

  Note:Pins designated should be in the closed position.

  The exact locations of Banks 0 & Bank 1 is unknown.

                          CPU TYPE CONFIGURATION

     Type         JMP2         JMP5        JMP7      JMP12       JMP13

   80386DX        Open        Closed       Open       Open     pins 2 & 3
                                                               and 5 & 6

   CX486DLC       Open         Open       Closed     Closed    pins 1 & 2
                                                               and 4 & 5

   80486SX      pins 1 & 2     Open       Closed     Closed    pins 1 & 2
                 closed                                        and 4 & 5

   80486DX      pins 2 & 3     Open       Closed     Closed    pins 1 & 2
                 closed                                        and 4 & 5

   80486DX2     pins 2 & 3     Open       Closed     Closed    pins 1 & 2
                 closed                                        and 4 & 5

  Note:Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

            Speed                     JMP9                  JMP14

        80386DX/25MHz          pins 1 & 5 and 2 &     pins 1 & 2 closed
                                    6 closed

        80386DX/33MHz          pins 1 & 5 and 4 &     pins 1 & 2 closed
                                    8 closed

        80386DX/40MHz          1 & 5, 3 & 7 and 4     pins 1 & 2 closed
                                   & 8 closed

        80486SX/50MHz          pins 3 & 7 closed      pins 2 & 3 closed

        80486DX/25MHz          pins 2 & 6 closed      pins 1 & 2 closed

        80486DX/33MHz          pins 4 & 8 closed      pins 1 & 2 closed

      80486DX2/50i MHz         pins 2 & 6 closed      pins 2 & 3 closed

      80486DX2/66i MHz         pins 4 & 8 closed      pins 1 & 2 closed

